I'll put my thoughts under spoiler just in case.
(SPOILER)I really liked Episode Ignis! It was really heartbreaking, and I really liked to see more Ignis' friendship with Noctis, and not just the adviser side of him. Ravus was a great companion, they're really badass together, and his story arc is really sad too. The post-credit scene made me cry, it was so sad and beautiful at the same time, just like the ending of the game.
The only thing I didn't like was the alternate ending. It was way too happy for my taste. FFXV is a tragedy and I really prefer it as a tragedy, and I really don't think Ignis would follow Ardyn.